package string;

public class StringBuilderDemo {
    public static void main(String[] args) {
       /* StringBuilder builder1=new StringBuilder();
        StringBuilder builder2=new StringBuilder("abc");
        String str="abc";
        StringBuilder builder3=new StringBuilder(str);
        str=builder3.toString();
        */
        String str="好好学习JAVA";
        StringBuilder builder=new StringBuilder(str);
        builder.append(",为了找个好工作");//追加内容，在末尾追加
        System.out.println(builder);
        builder.replace(9,16,"就是为了改变世界");//替换部分内容（含头不含尾）
        System.out.println(builder);
        builder.delete(0,8);
        System.out.println(builder);
        builder.insert(0,"活着");
        System.out.println(builder);
        builder.reverse();
        System.out.println(builder);



    }
}
